Map of the St. Louis area showing the position and track of the aircraft described in the post.

🇺🇸 N73445 - Boeing 737NG 924ER/W - United Airlines UAL2099/UA2099 (GRR-ORD-IAH) - 4.3 mi away @ 34050 ft, heading SW at 531 mph. Spotted 6x before! [11:12:01 AM CDT] #A9DCE9 #N73445 #B739 #UNITED #UAL2099 #UA2099 #ADSB #ADSBbot